Effect: Cookie attribute injection via domain, path, and name fields in @effect/platform makeCookie()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-115779
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-03 21:17:02 UTC
Updated2026-11-03 22:19:17 UTC
DescriptionEffect is a TypeScript framework that consists of several packages that work together to help build TypeScript applications. From @effect/platform 0.1.0 until 0.97.1 and effect 4.0.0-beta.0 until 4.0.0-beta.103, the name, domain, and path fields passed to makeCookie() allow semicolon delimiters that serializeCookie() writes verbatim into Set-Cookie headers. A caller that supplies attacker-controlled values can append cookie attributes, including a broader Domain or, when the caller has not set those options itself, SameSite=None or Max-Age. Encoded cookie values and CR or LF characters remain unaffected. This can widen a cookie's scope or add otherwise-unset cookie attributes. This issue is fixed in @effect/platform 0.97.1 and effect 4.0.0-beta.103.

Risk And Classification

Primary CVSS: v4.0 6.3 MEDIUM from [email protected]

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.006270000 probability, percentile 0.501850000 (date 2026-11-04)

Problem Types: CWE-74 | CWE-74 CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary6.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/C...
4.0CNADECLARED6.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Sub Conf.
Low
Sub Integrity
Low
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Effect-TS Effect affected >= 4.0.0-beta.0, < 4.0.0-beta.103 Not specified
CNA @effect Platform affected >= 0.1.0, < 0.97.1 Not specified

References

ReferenceSourceLinkTags
github.com/Effect-TS/effect/pull/6763 [email protected] github.com
github.com/Effect-TS/effect/releases/tag/[email protected] [email protected] github.com
github.com/Effect-TS/effect/commit/4a57af24011db1d66e947289d2f7ffc2074696d2 [email protected] github.com
github.com/Effect-TS/effect/commit/5859b373b9be04d5037a594196b4743ad80379bd [email protected] github.com
github.com/Effect-TS/effect/releases/tag/@effect/[email protected] [email protected] github.com
github.com/Effect-TS/effect/pull/6765 [email protected] github.com
github.com/Effect-TS/effect/security/advisories/GHSA-chp3-j5qr-2vfr [email protected] github.com
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